/**
 * OpenAL cross platform audio library
 * Copyright (C) 1999-2000 by authors.
 * This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the
 *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA  02111-1307, USA.
 * Or go to http://www.gnu.org/copyleft/lgpl.html
 */

#include <stdlib.h>
#include <math.h>
#include "alMain.h"
#include "al.h"
#include "alc.h"
#include "alError.h"
#include "alSource.h"

ALvoid InitSourceParams(ALsource *pSource);
ALboolean CheckSourceType(ALCcontext *pContext, ALsource *pSource);
ALboolean GetSourceOffset(ALCcontext *pContext, ALsource *pSource, ALenum eName, ALfloat *pflOffset);
ALvoid ApplyOffset(ALCcontext *pContext, ALsource *pSource, ALboolean bUpdateContext);
ALint GetByteOffset(ALCcontext *pContext, ALsource *pSource);

#define CLAMP(x, min, max) if (x < min)    x = min; else if (x > max) x = max;

extern ALboolean bEAX2Initialized;

ALAPI ALvoid ALAPIENTRY alGenSources(ALsizei n,ALuint *sources)
{
    ALCcontext *Context;
    ALsource *Source;
    ALCdevice *Device;
    ALsizei i=0;

    Context = alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (n > 0)
        {
            Device = alcGetContextsDevice(Context);

            if (Device)
            {
                // Check that enough memory has been allocted in the 'sources' array for n Sources
                if (!IsBadWritePtr((void*)sources, n * sizeof(ALuint)))
                {
                    // Check that the requested number of sources can be generated
                    if ((Context->SourceCount + n) <= Device->MaxNoOfSources)
                    {
                        // Have we create any Sources yet ?
                        if (!Context->Source)
                        {
                            // First Source to be created !
                            Context->Source=malloc(sizeof(ALsource));
                            if (Context->Source)
                            {
                                memset(Context->Source,0,sizeof(ALsource));

                                sources[i]=(ALuint)ALTHUNK_ADDENTRY(Context->Source);
                                Context->Source->source = sources[i];

                                InitSourceParams(Context->Source);

                                Context->SourceCount++;
                                i++;

                                UpdateContext(Context, ALSOURCE, (ALuint)Context->Source->source);
                            }

                            Source=Context->Source;
                        }
                        else
                        {
                            // Some number of sources have already been created - move to the end of the list
                            Source=Context->Source;
                            while (Source->next)
                                Source=Source->next;
                        }

                        // Add additional sources to the list (Source->next points to the location for the next Source structure)
                        while ((Source)&&(i<n))
                        {
                            Source->next=malloc(sizeof(ALsource));
                            if (Source->next)
                            {
                                memset(Source->next,0,sizeof(ALsource));
                                sources[i]=(ALuint)ALTHUNK_ADDENTRY(Source->next);
                                Source->next->source = sources[i];
                                Source->next->previous=Source;

                                InitSourceParams(Source->next);

                                Context->SourceCount++;
                                i++;

                                UpdateContext(Context, ALSOURCE, (ALuint)Source->next->source);

                                Source=Source->next;
                            }
                            else
                            {
                                // Out of memory
                                break;
                            }
                        }

                        // If we didn't create all the Sources, we must have run out or memory
                        if (i!=n)
                        {
                            alSetError(AL_OUT_OF_MEMORY);
                        }
                    }
                    else
                    {
                        // Not enough resources to create the Sources
                        alSetError(AL_INVALID_VALUE);
                    }
                }
                else
                {
                    // Bad pointer
                    alSetError(AL_INVALID_VALUE);
                }
            }
            else
            {
                // No Device created, or attached to Context
                alSetError(AL_INVALID_OPERATION);
            }
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alDeleteSources(ALsizei n, const ALuint *sources)
{
    ALCcontext *Context;
    ALCdevice  *Device;
    ALsource *ALSource;
    ALsizei i;
    ALbufferlistitem *ALBufferList;
    ALboolean bSourcesValid = AL_TRUE;

    Context = alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (n > 0)
        {
            Device = alcGetContextsDevice(Context);

            if (Device)
            {
                if ((ALuint)n <= Context->SourceCount)
                {
                    // Check that all Sources are valid (and can therefore be deleted)
                    for (i = 0; i < n; i++)
                    {
                        if (!alIsSource(sources[i]))
                        {
                            alSetError(AL_INVALID_NAME);
                            bSourcesValid = AL_FALSE;
                            break;
                        }
                    }

                    if (bSourcesValid)
                    {
                        // All Sources are valid, and can be deleted
                        for (i = 0; i < n; i++)
                        {
                            // Recheck that the Source is valid, because there could be duplicated Source names
                            if (alIsSource(sources[i]))
                            {
                                ALSource=((ALsource *)ALTHUNK_LOOKUPENTRY(sources[i]));
                                alSourceStop((ALuint)ALSource->source);

                                // For each buffer in the source's queue, decrement its reference counter and remove it
                                while (ALSource->queue != NULL)
                                {
                                    ALBufferList = ALSource->queue;
                                    // Decrement buffer's reference counter
                                    if (ALBufferList->buffer != 0)
                                        ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(ALBufferList->buffer)))->refcount--;
                                    // Update queue to point to next element in list
                                    ALSource->queue = ALBufferList->next;
                                    // Release memory allocated for buffer list item
                                    free(ALBufferList);
                                }

                                // Call UpdateContext with SDELETE flag to perform context specific deletion of source
                                ALSource->update1 = SDELETE;
                                UpdateContext(Context, ALSOURCE, (ALuint)ALSource->source);

                                // Decrement Source count
                                Context->SourceCount--;

                                // Remove Source from list of Sources
                                if (ALSource->previous)
                                    ALSource->previous->next=ALSource->next;
                                else
                                    Context->Source=ALSource->next;
                                if (ALSource->next)
                                    ALSource->next->previous=ALSource->previous;

                                ALTHUNK_REMOVEENTRY(ALSource->source);

                                memset(ALSource,0,sizeof(ALsource));
                                free(ALSource);
                            }
                        }

                    }
                }
                else
                {
                    // Trying to delete more Sources than have been generated
                    alSetError(AL_INVALID_NAME);
                }
            }
            else
            {
                // No Device created, or attached to Context
                alSetError(AL_INVALID_OPERATION);
            }


        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALboolean ALAPIENTRY alIsSource(ALuint source)
{
    ALboolean result=AL_FALSE;
    ALCcontext *Context;
    ALsource *Source;
    unsigned int i;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        // To determine if this is a valid Source name, look through the list of generated Sources
        Source = Context->Source;
        for (i = 0; i < Context->SourceCount; i++)
        {
            if (Source == (ALsource*)ALTHUNK_LOOKUPENTRY(source))
            {
                result = AL_TRUE;
                break;
            }

            Source = Source->next;
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return result;
}


ALAPI ALvoid ALAPIENTRY alSourcef(ALuint source, ALenum eParam, ALfloat flValue)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (alIsSource(source))
        {
            pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

            switch (eParam)
            {
            case AL_PITCH:
                if (flValue >= 0.0f)
                {
                    if (flValue != pSource->flPitch)
                    {
                        pSource->flPitch = flValue;
                        if (pSource->flPitch < 0.001f)
                            pSource->flPitch = 0.001f;
                        pSource->update1 |= FREQUENCY;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_CONE_INNER_ANGLE:
                if ((flValue >= 0.0f) && (flValue <= 360.0f))
                {
                    if (flValue != pSource->flInnerAngle)
                    {
                        pSource->flInnerAngle = flValue;
                        pSource->update1 |= CONEANGLES;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_CONE_OUTER_ANGLE:
                if ((flValue >= 0.0f) && (flValue <= 360.0f))
                {
                    if (flValue != pSource->flOuterAngle)
                    {
                        pSource->flOuterAngle = flValue;
                        pSource->update1 |= CONEANGLES;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_GAIN:
                if (flValue >= 0.0f)
                {
                    if (flValue != pSource->flGain)
                    {
                        pSource->flGain = flValue;
                        pSource->update1 |= VOLUME;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_MAX_DISTANCE:
                if (flValue >= 0.0f)
                {
                    if (flValue != pSource->flMaxDistance)
                    {
                        pSource->flMaxDistance = flValue;
                        pSource->update1 |= MAXDIST;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_ROLLOFF_FACTOR:
                if (flValue >= 0.0f)
                {
                    if (flValue != pSource->flRollOffFactor)
                    {
                        pSource->flRollOffFactor = flValue;
                        pSource->update1 |= ROLLOFFFACTOR;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_REFERENCE_DISTANCE:
                if (flValue >= 0.0f)
                {
                    if (flValue != pSource->flRefDistance)
                    {
                        pSource->flRefDistance = flValue;
                        pSource->update1 |= MINDIST;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_MIN_GAIN:
                if ((flValue >= 0.0f) && (flValue <= 1.0f))
                {
                    if (flValue != pSource->flMinGain)
                    {
                        pSource->flMinGain = flValue;
                        pSource->update1 |= MINGAIN;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_MAX_GAIN:
                if ((flValue >= 0.0f) && (flValue <= 1.0f))
                {
                    if (flValue != pSource->flMaxGain)
                    {
                        pSource->flMaxGain = flValue;
                        pSource->update1 |= MAXGAIN;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_CONE_OUTER_GAIN:
                if ((flValue >= 0.0f) && (flValue <= 1.0f))
                {
                    if (flValue != pSource->flOuterGain)
                    {
                        pSource->flOuterGain = flValue;
                        pSource->update1 |= CONEOUTSIDEVOLUME;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_SEC_OFFSET:
            case AL_SAMPLE_OFFSET:
            case AL_BYTE_OFFSET:
                if (flValue >= 0.0f)
                {
                    pSource->lOffsetType = eParam;

                    // Store Offset (convert Seconds into Milliseconds)
                    if (eParam == AL_SEC_OFFSET)
                        pSource->lOffset = (ALint)(flValue * 1000.0f);
                    else
                        pSource->lOffset = (ALint)flValue;

                    if ((pSource->state == AL_PLAYING) || (pSource->state == AL_PAUSED))
                        ApplyOffset(pContext, pSource, AL_TRUE);
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            default:
                alSetError(AL_INVALID_ENUM);
                break;
            }
        }
        else
        {
            // Invalid Source Name
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(pContext);
    }
    else
    {
        // Invalid context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alSource3f(ALuint source, ALenum eParam, ALfloat flValue1,ALfloat flValue2,ALfloat flValue3)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (alIsSource(source))
        {
            pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));
            switch(eParam)
            {
            case AL_POSITION:
                if ((flValue1 != pSource->vPosition[0])||
                    (flValue2 != pSource->vPosition[1])||
                    (flValue3 != pSource->vPosition[2]))
                {
                    pSource->vPosition[0] = flValue1;
                    pSource->vPosition[1] = flValue2;
                    pSource->vPosition[2] = flValue3;
                    pSource->update1 |= POSITION;
                    UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                }
                break;

            case AL_VELOCITY:
                if ((flValue1 != pSource->vVelocity[0])||
                    (flValue2 != pSource->vVelocity[1])||
                    (flValue3 != pSource->vVelocity[2]))
                {
                    pSource->vVelocity[0] = flValue1;
                    pSource->vVelocity[1] = flValue2;
                    pSource->vVelocity[2] = flValue3;
                    pSource->update1 |= VELOCITY;
                    UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                }
                break;

            case AL_DIRECTION:
                if ((flValue1 != pSource->vOrientation[0])||
                    (flValue2 != pSource->vOrientation[1])||
                    (flValue3 != pSource->vOrientation[2]))
                {
                    pSource->vOrientation[0] = flValue1;
                    pSource->vOrientation[1] = flValue2;
                    pSource->vOrientation[2] = flValue3;
                    pSource->update1 |= ORIENTATION;
                    UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                }
                break;

            default:
                alSetError(AL_INVALID_ENUM);
                break;
            }
        }
        else
        {
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alSourcefv(ALuint source, ALenum eParam, const ALfloat *pflValues)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (pflValues)
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch (eParam)
                {
                case AL_PITCH:
                case AL_CONE_INNER_ANGLE:
                case AL_CONE_OUTER_ANGLE:
                case AL_GAIN:
                case AL_MAX_DISTANCE:
                case AL_ROLLOFF_FACTOR:
                case AL_REFERENCE_DISTANCE:
                case AL_MIN_GAIN:
                case AL_MAX_GAIN:
                case AL_CONE_OUTER_GAIN:
                case AL_SEC_OFFSET:
                case AL_SAMPLE_OFFSET:
                case AL_BYTE_OFFSET:
                    alSourcef(source, eParam, pflValues[0]);
                    break;

                case AL_POSITION:
                case AL_VELOCITY:
                case AL_DIRECTION:
                    alSource3f(source, eParam, pflValues[0], pflValues[1], pflValues[2]);
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alSourcei(ALuint source,ALenum eParam,ALint lValue)
{
    ALCcontext            *pContext;
    ALsource            *pSource;
    ALbufferlistitem    *pALBufferListItem;
    ALint                Counter = 0;
    ALint                DataSize = 0;
    ALint                BufferSize;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (alIsSource(source))
        {
            pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

            switch(eParam)
            {
            case AL_MAX_DISTANCE:
            case AL_ROLLOFF_FACTOR:
            case AL_REFERENCE_DISTANCE:
                alSourcef(source, eParam, (ALfloat)lValue);
                break;

            case AL_SOURCE_RELATIVE:
                if ((lValue == AL_FALSE) || (lValue == AL_TRUE))
                {
                    if (lValue != pSource->bHeadRelative)
                    {
                        pSource->bHeadRelative = (ALboolean)lValue;
                        pSource->update1 |= MODE;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_CONE_INNER_ANGLE:
                if ((lValue >= 0) && (lValue <= 360))
                {
                    if (((float)lValue) != pSource->flInnerAngle)
                    {
                        pSource->flInnerAngle = (float)lValue;
                        pSource->update1 |= CONEANGLES;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_CONE_OUTER_ANGLE:
                if ((lValue >= 0) && (lValue <= 360))
                {
                    if (((float)lValue) != pSource->flOuterAngle)
                    {
                        pSource->flOuterAngle = (float)lValue;
                        pSource->update1 |= CONEANGLES;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_LOOPING:
                if ((lValue == AL_FALSE) || (lValue == AL_TRUE))
                {
                    if (lValue != pSource->bLooping)
                    {
                        pSource->bLooping = (ALboolean)lValue;
                        pSource->update1 |= LOOPED;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            case AL_BUFFER:
                if ((pSource->state == AL_STOPPED) || (pSource->state == AL_INITIAL))
                {
                    if (alIsBuffer(lValue))
                    {
                        // Remove all elements in the queue
                        while (pSource->queue != NULL)
                        {
                            pALBufferListItem = pSource->queue;
                            pSource->queue = pALBufferListItem->next;
                            // Decrement reference counter for buffer
                            if (pALBufferListItem->buffer)
                                ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(pALBufferListItem->buffer)))->refcount--;
                            // Record size of buffer
                            BufferSize = ((ALbuffer*)ALTHUNK_LOOKUPENTRY(pALBufferListItem->buffer))->size;
                            DataSize += BufferSize;
                            // Increment the number of buffers removed from queue
                            Counter++;
                            // Release memory for buffer list item
                            free(pALBufferListItem);
                            // Decrement the number of buffers in the queue
                            pSource->BuffersInQueue--;
                        }

                        // Update variables required by the SUNQUEUE routine in UpdateContext
                        pSource->NumBuffersRemovedFromQueue = Counter;
                        pSource->SizeOfBufferDataRemovedFromQueue = DataSize;
                        pSource->update1 |= SUNQUEUE;
                        UpdateContext(pContext, ALSOURCE, source);

                        // Add the buffer to the queue (as long as it is NOT the NULL buffer)
                        if (lValue != 0)
                        {
                            // Source is now in STATIC mode
                            pSource->lSourceType = AL_STATIC;

                            // Add the selected buffer to the queue
                            pALBufferListItem = malloc(sizeof(ALbufferlistitem));
                            pALBufferListItem->buffer = lValue;
                            pALBufferListItem->bufferstate = PENDING;
                            pALBufferListItem->flag = 0;
                            pALBufferListItem->next = NULL;

                            pSource->queue = pALBufferListItem;
                            pSource->BuffersInQueue = 1;

                            DataSize = ((ALbuffer*)ALTHUNK_LOOKUPENTRY(lValue))->size;

                            // Increment reference counter for buffer
                            ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(lValue)))->refcount++;

                            pSource->SizeOfBufferDataAddedToQueue = DataSize;
                            pSource->NumBuffersAddedToQueue = 1;
                            pSource->update1 |= SQUEUE;
                            UpdateContext(pContext, ALSOURCE, source);
                        }
                        else
                        {
                            // Source is now in UNDETERMINED mode
                            pSource->lSourceType = AL_UNDETERMINED;
                        }

                        // Set Buffers Processed
                        pSource->BuffersProcessed = 0;

                        // Update AL_BUFFER parameter
                        pSource->ulBufferID = lValue;

                        // Check if we need to switch from mono->stereo or vice versa
                        if (pContext->Device->lpDS3DListener)
                            CheckSourceType(pContext, pSource);
                    }
                    else
                    {
                        alSetError(AL_INVALID_VALUE);
                    }
                }
                else
                {
                    alSetError(AL_INVALID_OPERATION);
                }
                break;

            case AL_SOURCE_STATE:
                // Query only
                alSetError(AL_INVALID_OPERATION);
                break;

            case AL_SEC_OFFSET:
            case AL_SAMPLE_OFFSET:
            case AL_BYTE_OFFSET:
                if (lValue >= 0)
                {
                    pSource->lOffsetType = eParam;

                    // Store Offset (convert Seconds into Milliseconds)
                    if (eParam == AL_SEC_OFFSET)
                        pSource->lOffset = lValue * 1000;
                    else
                        pSource->lOffset = lValue;

                    if ((pSource->state == AL_PLAYING) || (pSource->state == AL_PAUSED))
                        ApplyOffset(pContext, pSource, AL_TRUE);
                }
                else
                {
                    alSetError(AL_INVALID_VALUE);
                }
                break;

            default:
                alSetError(AL_INVALID_ENUM);
                break;
            }
        }
        else
        {
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI void ALAPIENTRY alSource3i(ALuint source, ALenum eParam, ALint lValue1, ALint lValue2, ALint lValue3)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (alIsSource(source))
        {
            pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

            switch (eParam)
            {
            case AL_POSITION:
            case AL_VELOCITY:
            case AL_DIRECTION:
                alSource3f(source, eParam, (ALfloat)lValue1, (ALfloat)lValue2, (ALfloat)lValue3);
                break;

            default:
                alSetError(AL_INVALID_ENUM);
                break;
            }
        }
        else
        {
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI void ALAPIENTRY alSourceiv(ALuint source, ALenum eParam, const ALint* plValues)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (plValues)
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch (eParam)
                {
                case AL_SOURCE_RELATIVE:
                case AL_CONE_INNER_ANGLE:
                case AL_CONE_OUTER_ANGLE:
                case AL_LOOPING:
                case AL_BUFFER:
                case AL_SOURCE_STATE:
                case AL_SEC_OFFSET:
                case AL_SAMPLE_OFFSET:
                case AL_BYTE_OFFSET:
                case AL_MAX_DISTANCE:
                case AL_ROLLOFF_FACTOR:
                case AL_REFERENCE_DISTANCE:
                    alSourcei(source, eParam, plValues[0]);
                    break;

                case AL_POSITION:
                case AL_VELOCITY:
                case AL_DIRECTION:
                    alSource3i(source, eParam, plValues[0], plValues[1], plValues[2]);
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alGetSourcef(ALuint source, ALenum eParam, ALfloat *pflValue)
{
    ALCcontext    *pContext;
    ALsource    *pSource;
    ALfloat        flOffset;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (pflValue)
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch(eParam)
                {
                case AL_PITCH:
                    *pflValue = pSource->flPitch;
                    break;

                case AL_GAIN:
                    *pflValue = pSource->flGain;
                    break;

                case AL_MIN_GAIN:
                    *pflValue = pSource->flMinGain;
                    break;

                case AL_MAX_GAIN:
                    *pflValue = pSource->flMaxGain;
                    break;

                case AL_MAX_DISTANCE:
                    *pflValue = pSource->flMaxDistance;
                    break;

                case AL_ROLLOFF_FACTOR:
                    *pflValue = pSource->flRollOffFactor;
                    break;

                case AL_CONE_OUTER_GAIN:
                    *pflValue = pSource->flOuterGain;
                    break;

                case AL_SEC_OFFSET:
                case AL_SAMPLE_OFFSET:
                case AL_BYTE_OFFSET:
                    if (GetSourceOffset(pContext, pSource, eParam, &flOffset))
                        *pflValue = flOffset;
                    else
                        alSetError(AL_INVALID_OPERATION);
                    break;

                case AL_CONE_INNER_ANGLE:
                    *pflValue = pSource->flInnerAngle;
                    break;

                case AL_CONE_OUTER_ANGLE:
                    *pflValue = pSource->flOuterAngle;
                    break;

                case AL_REFERENCE_DISTANCE:
                    *pflValue = pSource->flRefDistance;
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alGetSource3f(ALuint source, ALenum eParam, ALfloat* pflValue1, ALfloat* pflValue2, ALfloat* pflValue3)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if ((pflValue1) && (pflValue2) && (pflValue3))
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch(eParam)
                {
                case AL_POSITION:
                    *pflValue1 = pSource->vPosition[0];
                    *pflValue2 = pSource->vPosition[1];
                    *pflValue3 = pSource->vPosition[2];
                    break;

                case AL_VELOCITY:
                    *pflValue1 = pSource->vVelocity[0];
                    *pflValue2 = pSource->vVelocity[1];
                    *pflValue3 = pSource->vVelocity[2];
                    break;

                case AL_DIRECTION:
                    *pflValue1 = pSource->vOrientation[0];
                    *pflValue2 = pSource->vOrientation[1];
                    *pflValue3 = pSource->vOrientation[2];
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alGetSourcefv(ALuint source, ALenum eParam, ALfloat *pflValues)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (pflValues)
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch(eParam)
                {
                case AL_PITCH:
                case AL_GAIN:
                case AL_MIN_GAIN:
                case AL_MAX_GAIN:
                case AL_MAX_DISTANCE:
                case AL_ROLLOFF_FACTOR:
                case AL_CONE_OUTER_GAIN:
                case AL_SEC_OFFSET:
                case AL_SAMPLE_OFFSET:
                case AL_BYTE_OFFSET:
                case AL_CONE_INNER_ANGLE:
                case AL_CONE_OUTER_ANGLE:
                case AL_REFERENCE_DISTANCE:
                    alGetSourcef(source, eParam, pflValues);
                    break;

                case AL_POSITION:
                    pflValues[0] = pSource->vPosition[0];
                    pflValues[1] = pSource->vPosition[1];
                    pflValues[2] = pSource->vPosition[2];
                    break;

                case AL_VELOCITY:
                    pflValues[0] = pSource->vVelocity[0];
                    pflValues[1] = pSource->vVelocity[1];
                    pflValues[2] = pSource->vVelocity[2];
                    break;

                case AL_DIRECTION:
                    pflValues[0] = pSource->vOrientation[0];
                    pflValues[1] = pSource->vOrientation[1];
                    pflValues[2] = pSource->vOrientation[2];
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alGetSourcei(ALuint source, ALenum eParam, ALint *plValue)
{
    ALCcontext *pContext;
    ALsource   *pSource;
    ALfloat        flOffset;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (plValue)
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch(eParam)
                {
                case AL_MAX_DISTANCE:
                    *plValue = (ALint)pSource->flMaxDistance;
                    break;

                case AL_ROLLOFF_FACTOR:
                    *plValue = (ALint)pSource->flRollOffFactor;
                    break;

                case AL_REFERENCE_DISTANCE:
                    *plValue = (ALint)pSource->flRefDistance;
                    break;

                case AL_SOURCE_RELATIVE:
                    *plValue = pSource->bHeadRelative;
                    break;

                case AL_CONE_INNER_ANGLE:
                    *plValue = (ALint)pSource->flInnerAngle;
                    break;

                case AL_CONE_OUTER_ANGLE:
                    *plValue = (ALint)pSource->flOuterAngle;
                    break;

                case AL_LOOPING:
                    *plValue = pSource->bLooping;
                    break;

                case AL_BUFFER:
                    *plValue = pSource->ulBufferID;
                    break;

                case AL_SOURCE_STATE:
                    *plValue = pSource->state;
                    break;

                case AL_BUFFERS_QUEUED:
                    *plValue = pSource->BuffersInQueue;
                    break;

                case AL_BUFFERS_PROCESSED:
                    *plValue = pSource->BuffersProcessed;
                    break;

                case AL_SOURCE_TYPE:
                    *plValue = pSource->lSourceType;
                    break;

                case AL_SEC_OFFSET:
                case AL_SAMPLE_OFFSET:
                case AL_BYTE_OFFSET:
                    if (GetSourceOffset(pContext, pSource, eParam, &flOffset))
                        *plValue = (ALint)flOffset;
                    else
                        alSetError(AL_INVALID_OPERATION);
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI void ALAPIENTRY alGetSource3i(ALuint source, ALenum eParam, ALint* plValue1, ALint* plValue2, ALint* plValue3)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if ((plValue1) && (plValue2) && (plValue3))
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch(eParam)
                {
                case AL_POSITION:
                    *plValue1 = (ALint)pSource->vPosition[0];
                    *plValue2 = (ALint)pSource->vPosition[1];
                    *plValue3 = (ALint)pSource->vPosition[2];
                    break;

                case AL_VELOCITY:
                    *plValue1 = (ALint)pSource->vVelocity[0];
                    *plValue2 = (ALint)pSource->vVelocity[1];
                    *plValue3 = (ALint)pSource->vVelocity[2];
                    break;

                case AL_DIRECTION:
                    *plValue1 = (ALint)pSource->vOrientation[0];
                    *plValue2 = (ALint)pSource->vOrientation[1];
                    *plValue3 = (ALint)pSource->vOrientation[2];
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI void ALAPIENTRY alGetSourceiv(ALuint source, ALenum eParam, ALint* plValues)
{
    ALCcontext    *pContext;
    ALsource    *pSource;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (plValues)
        {
            if (alIsSource(source))
            {
                pSource = ((ALsource *)ALTHUNK_LOOKUPENTRY(source));

                switch (eParam)
                {
                case AL_SOURCE_RELATIVE:
                case AL_CONE_INNER_ANGLE:
                case AL_CONE_OUTER_ANGLE:
                case AL_LOOPING:
                case AL_BUFFER:
                case AL_SOURCE_STATE:
                case AL_BUFFERS_QUEUED:
                case AL_BUFFERS_PROCESSED:
                case AL_SEC_OFFSET:
                case AL_SAMPLE_OFFSET:
                case AL_BYTE_OFFSET:
                case AL_MAX_DISTANCE:
                case AL_ROLLOFF_FACTOR:
                case AL_REFERENCE_DISTANCE:
                case AL_SOURCE_TYPE:
                    alGetSourcei(source, eParam, plValues);
                    break;

                case AL_POSITION:
                    plValues[0] = (ALint)pSource->vPosition[0];
                    plValues[1] = (ALint)pSource->vPosition[1];
                    plValues[2] = (ALint)pSource->vPosition[2];
                    break;

                case AL_VELOCITY:
                    plValues[0] = (ALint)pSource->vVelocity[0];
                    plValues[1] = (ALint)pSource->vVelocity[1];
                    plValues[2] = (ALint)pSource->vVelocity[2];
                    break;

                case AL_DIRECTION:
                    plValues[0] = (ALint)pSource->vOrientation[0];
                    plValues[1] = (ALint)pSource->vOrientation[1];
                    plValues[2] = (ALint)pSource->vOrientation[2];
                    break;

                default:
                    alSetError(AL_INVALID_ENUM);
                    break;
                }
            }
            else
            {
                alSetError(AL_INVALID_NAME);
            }
        }
        else
        {
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(pContext);
    }
    else
    {
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alSourcePlay(ALuint source)
{
    ALCcontext *pContext;
    ALsource *pSource;
    ALboolean bPlay = AL_FALSE;
    ALbufferlistitem *ALBufferList = NULL;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (alIsSource(source))
        {
            pSource=((ALsource *)ALTHUNK_LOOKUPENTRY(source));

            // Check that there is a queue containing at least one non-null, non zero length AL Buffer
            ALBufferList = pSource->queue;
            while (ALBufferList)
            {
                if ((ALBufferList->buffer != 0) && (((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALBufferList->buffer))->size))
                {
                    bPlay = AL_TRUE;
                    break;
                }
                ALBufferList = ALBufferList->next;
            }

            if (bPlay)
            {
                if (pSource->state != AL_PAUSED)
                {
                    pSource->state = AL_PLAYING;
                    pSource->inuse = AL_TRUE;
                    pSource->play = AL_TRUE;
                    pSource->position = 0;
                    pSource->position_fraction = 0;
                    pSource->BuffersProcessed = 0;
                    pSource->BuffersAddedToDSBuffer = 0;
                    pSource->BufferPosition = 0;
                    pSource->lBytesPlayed = 0;
                    pSource->FinishedQueue = AL_FALSE;
                    pSource->Silence = 0;
                    pSource->SilenceAdded = 0;

                    pSource->ulBufferID = pSource->queue->buffer;

                    // Make sure all the Buffers in the queue are marked as PENDING
                    ALBufferList = pSource->queue;
                    while (ALBufferList)
                    {
                        ALBufferList->bufferstate = PENDING;
                        ALBufferList = ALBufferList->next;
                    }
                }
                else
                {
                    pSource->state = AL_PLAYING;
                    pSource->inuse = AL_TRUE;
                    pSource->play = AL_TRUE;
                }

                // Check if an Offset has been Set
                if (pSource->lOffset)
                    ApplyOffset(pContext, pSource, AL_FALSE);

                pSource->update1 |= STATE;
                UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
            }
            else
            {
                // If there is a queue (must all be NULL or Zero length Buffers) mark them all as processed
                ALBufferList = pSource->queue;
                while (ALBufferList)
                {
                    ALBufferList->bufferstate = PROCESSED;
                    ALBufferList = ALBufferList->next;
                }

                pSource->BuffersAddedToDSBuffer = pSource->BuffersProcessed = pSource->BuffersInQueue;
            }
        }
        else
        {
            // Invalid Source Name
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(pContext);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}

ALAPI ALvoid ALAPIENTRY alSourcePlayv(ALsizei n, const ALuint *pSourceList)
{
    ALCcontext            *pContext;
    ALsource            *pSource;
    ALbufferlistitem    *ALBufferList;
    ALsizei                i;
    ALboolean            bSourcesValid = AL_TRUE;
    ALboolean            bPlay;

    pContext = alcGetCurrentContext();
    if (pContext)
    {
        SuspendContext(pContext);

        if (pSourceList)
        {
            // Check that all the Sources are valid
            for (i = 0; i < n; i++)
            {
                if (!alIsSource(pSourceList[i]))
                {
                    alSetError(AL_INVALID_NAME);
                    bSourcesValid = AL_FALSE;
                    break;
                }
            }

            if (bSourcesValid)
            {
                for (i = 0; i < n; i++)
                {
                    // Assume Source won't need to play
                    bPlay = AL_FALSE;

                    pSource = ((ALsource*)ALTHUNK_LOOKUPENTRY(pSourceList[i]));

                    // Check that there is a queue containing at least one non-null, non zero length AL Buffer
                    ALBufferList = pSource->queue;
                    while (ALBufferList)
                    {
                        if ((ALBufferList->buffer != 0) && (((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALBufferList->buffer))->size))
                        {
                            bPlay = AL_TRUE;
                            break;
                        }
                        ALBufferList = ALBufferList->next;
                    }

                    if (bPlay)
                    {
                        if (pSource->state != AL_PAUSED)
                        {
                            pSource->state = AL_PLAYING;
                            pSource->inuse = AL_TRUE;
                            pSource->play = AL_TRUE;
                            pSource->position = 0;
                            pSource->position_fraction = 0;
                            pSource->BuffersProcessed = 0;
                            pSource->BuffersAddedToDSBuffer = 0;
                            pSource->BufferPosition = 0;
                            pSource->lBytesPlayed = 0;
                            pSource->FinishedQueue = AL_FALSE;
                            pSource->Silence = 0;
                            pSource->SilenceAdded = 0;

                            pSource->ulBufferID = pSource->queue->buffer;

                            // Make sure all the Buffers in the queue are marked as PENDING
                            ALBufferList = pSource->queue;
                            while (ALBufferList)
                            {
                                ALBufferList->bufferstate = PENDING;
                                ALBufferList = ALBufferList->next;
                            }
                        }
                        else
                        {
                            pSource->state = AL_PLAYING;
                            pSource->inuse = AL_TRUE;
                            pSource->play = AL_TRUE;
                        }

                        // Check if an Offset has been set
                        if (pSource->lOffset)
                            ApplyOffset(pContext, pSource, AL_FALSE);

                        pSource->update1 |= STATE;
                        UpdateContext(pContext, ALSOURCE, (ALuint)pSource->source);
                    }
                    else
                    {
                        // If there is a queue (must all be NULL or Zero length Buffers) mark them all as processed
                        ALBufferList = pSource->queue;
                        while (ALBufferList)
                        {
                            ALBufferList->bufferstate = PROCESSED;
                            ALBufferList = ALBufferList->next;
                        }

                        pSource->BuffersAddedToDSBuffer = pSource->BuffersProcessed = pSource->BuffersInQueue;
                    }
                }
            }
        }
        else
        {
            // sources is a NULL pointer
            alSetError(AL_INVALID_VALUE);

        }

        ProcessContext(pContext);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}

ALAPI ALvoid ALAPIENTRY alSourcePause(ALuint source)
{
    ALCcontext *Context;
    ALsource *Source;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (alIsSource(source))
        {
            Source=((ALsource *)ALTHUNK_LOOKUPENTRY(source));
            if (Source->state==AL_PLAYING)
            {
                Source->state=AL_PAUSED;
                Source->inuse=AL_FALSE;
            }
            Source->update1 |= STATE;
            UpdateContext(Context, ALSOURCE, (ALuint)Source->source);
        }
        else
        {
            // Invalid Source Name
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}

ALAPI ALvoid ALAPIENTRY alSourcePausev(ALsizei n, const ALuint *sources)
{
    ALCcontext *Context;
    ALsource *Source;
    ALsizei i;
    ALboolean bSourcesValid = AL_TRUE;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (sources)
        {
            // Check all the Sources are valid
            for (i=0;i<n;i++)
            {
                if (!alIsSource(sources[i]))
                {
                    alSetError(AL_INVALID_NAME);
                    bSourcesValid = AL_FALSE;
                    break;
                }
            }

            if (bSourcesValid)
            {
                for (i=0;i<n;i++)
                {
                    Source=((ALsource *)ALTHUNK_LOOKUPENTRY(sources[i]));
                    if (Source->state==AL_PLAYING)
                    {
                        Source->state=AL_PAUSED;
                        Source->inuse=AL_FALSE;
                    }
                    Source->update1 |= STATE;
                    UpdateContext(Context, ALSOURCE, (ALuint)Source->source);
                }
            }
        }
        else
        {
            // sources is a NULL pointer
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}

ALAPI ALvoid ALAPIENTRY alSourceStop(ALuint source)
{
    ALCcontext *Context;
    ALsource *Source;
    ALbufferlistitem *ALBufferListItem;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (alIsSource(source))
        {
            Source=((ALsource *)ALTHUNK_LOOKUPENTRY(source));
            if (Source->state!=AL_INITIAL)
            {
                Source->state=AL_STOPPED;
                Source->inuse=AL_FALSE;
                Source->BuffersAddedToDSBuffer = Source->BuffersProcessed = Source->BuffersInQueue;
                ALBufferListItem= Source->queue;
                while (ALBufferListItem != NULL)
                {
                    ALBufferListItem->bufferstate = PROCESSED;
                    ALBufferListItem = ALBufferListItem->next;
                }
            }
            Source->lOffset = 0;
            Source->update1 |= STATE;
            UpdateContext(Context, ALSOURCE, (ALuint)Source->source);
        }
        else
        {
            // Invalid Source Name
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}

ALAPI ALvoid ALAPIENTRY alSourceStopv(ALsizei n, const ALuint *sources)
{
    ALCcontext *Context;
    ALsource *Source;
    ALsizei i;
    ALbufferlistitem *ALBufferListItem;
    ALboolean bSourcesValid = AL_TRUE;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (sources)
        {
            // Check all the Sources are valid
            for (i=0;i<n;i++)
            {
                if (!alIsSource(sources[i]))
                {
                    alSetError(AL_INVALID_NAME);
                    bSourcesValid = AL_FALSE;
                    break;
                }
            }

            if (bSourcesValid)
            {
                for (i=0;i<n;i++)
                {
                    Source=((ALsource *)ALTHUNK_LOOKUPENTRY(sources[i]));
                    if (Source->state!=AL_INITIAL)
                    {
                        Source->state=AL_STOPPED;
                        Source->inuse=AL_FALSE;
                        Source->BuffersAddedToDSBuffer = Source->BuffersProcessed = Source->BuffersInQueue;
                        ALBufferListItem= Source->queue;
                        while (ALBufferListItem != NULL)
                        {
                            ALBufferListItem->bufferstate = PROCESSED;
                            ALBufferListItem = ALBufferListItem->next;
                        }
                    }
                    Source->lOffset = 0;
                    Source->update1 |= STATE;
                    UpdateContext(Context, ALSOURCE, (ALuint)Source->source);
                }
            }
        }
        else
        {
            // sources is a NULL pointer
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}

ALAPI ALvoid ALAPIENTRY alSourceRewind(ALuint source)
{
    ALCcontext *Context;
    ALsource *Source;
    ALbufferlistitem *ALBufferListItem;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (alIsSource(source))
        {
            Source=((ALsource *)ALTHUNK_LOOKUPENTRY(source));
            if (Source->state!=AL_INITIAL)
            {
                Source->state=AL_INITIAL;
                Source->inuse=AL_FALSE;
                Source->position=0;
                Source->position_fraction=0;
                Source->BuffersProcessed = 0;
                ALBufferListItem= Source->queue;
                while (ALBufferListItem != NULL)
                {
                    ALBufferListItem->bufferstate = PENDING;
                    ALBufferListItem = ALBufferListItem->next;
                }
                if (Source->queue)
                    Source->ulBufferID = Source->queue->buffer;
            }
            Source->lOffset = 0;
            Source->update1 |= STATE;
            UpdateContext(Context, ALSOURCE, (ALuint)Source->source);
        }
        else
        {
            // Invalid Source Name
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}

ALAPI ALvoid ALAPIENTRY alSourceRewindv(ALsizei n, const ALuint *sources)
{
    ALCcontext *Context;
    ALsource *Source;
    ALsizei i;
    ALbufferlistitem *ALBufferListItem;
    ALboolean bSourcesValid = AL_TRUE;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (sources)
        {
            // Check all the Sources are valid
            for (i=0;i<n;i++)
            {
                if (!alIsSource(sources[i]))
                {
                    alSetError(AL_INVALID_NAME);
                    bSourcesValid = AL_FALSE;
                    break;
                }
            }

            if (bSourcesValid)
            {
                for (i=0;i<n;i++)
                {
                    Source=((ALsource *)ALTHUNK_LOOKUPENTRY(sources[i]));
                    if (Source->state!=AL_INITIAL)
                    {
                        Source->state=AL_INITIAL;
                        Source->inuse=AL_FALSE;
                        Source->position=0;
                        Source->position_fraction=0;
                        Source->BuffersProcessed = 0;
                        ALBufferListItem= Source->queue;
                        while (ALBufferListItem != NULL)
                        {
                            ALBufferListItem->bufferstate = PENDING;
                            ALBufferListItem = ALBufferListItem->next;
                        }
                        if (Source->queue)
                            Source->ulBufferID = Source->queue->buffer;
                    }
                    Source->lOffset = 0;
                    Source->update1 |= STATE;
                    UpdateContext(Context, ALSOURCE, (ALuint)Source->source);
                }
            }
        }
        else
        {
            // sources is a NULL pointer
            alSetError(AL_INVALID_VALUE);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALAPI ALvoid ALAPIENTRY alSourceQueueBuffers( ALuint source, ALsizei n, const ALuint* buffers )
{
    ALCcontext *Context;
    ALsource *ALSource;
    ALsizei i;
    ALbufferlistitem *ALBufferList;
    ALbufferlistitem *ALBufferListStart;
    ALuint DataSize;
    ALuint BufferSize;
    ALint iFrequency;
    ALint iFormat;
    ALboolean bBuffersValid = AL_TRUE;

    if (n == 0)
        return;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        DataSize = 0;
        BufferSize = 0;

        // Check that all buffers are valid or zero and that the source is valid

        // Check that this is a valid source
        if (alIsSource(source))
        {
            ALSource = (ALsource*)ALTHUNK_LOOKUPENTRY(source);

            // Check that this is not a STATIC Source
            if (ALSource->lSourceType != AL_STATIC)
            {
                iFrequency = -1;
                iFormat = -1;

                // Check existing Queue (if any) for a valid Buffers and get its frequency and format
                ALBufferList = ALSource->queue;
                while (ALBufferList)
                {
                    if (ALBufferList->buffer)
                    {
                        iFrequency = ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(ALBufferList->buffer)))->frequency;
                        iFormat = ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(ALBufferList->buffer)))->format;
                        break;
                    }
                    ALBufferList = ALBufferList->next;
                }

                for (i = 0; i < n; i++)
                {
                    if (alIsBuffer(buffers[i]))
                    {
                        if (buffers[i])
                        {
                            if ((iFrequency == -1) && (iFormat == -1))
                            {
                                iFrequency = ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(buffers[i])))->frequency;
                                iFormat = ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(buffers[i])))->format;
                            }
                            else
                            {
                                if ((iFrequency != ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(buffers[i])))->frequency) ||
                                    (iFormat != ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(buffers[i])))->format))
                                {
                                    alSetError(AL_INVALID_OPERATION);
                                    bBuffersValid = AL_FALSE;
                                    break;
                                }
                            }
                        }
                    }
                    else
                    {
                        alSetError(AL_INVALID_NAME);
                        bBuffersValid = AL_FALSE;
                        break;
                    }
                }

                if (bBuffersValid)
                {
                    // Change Source Type
                    ALSource->lSourceType = AL_STREAMING;

                    // All buffers are valid - so add them to the list
                    ALBufferListStart = malloc(sizeof(ALbufferlistitem));
                    ALBufferListStart->buffer = buffers[0];
                    ALBufferListStart->bufferstate = PENDING;
                    ALBufferListStart->flag = 0;
                    ALBufferListStart->next = NULL;

                    if (buffers[0])
                        BufferSize = ((ALbuffer*)ALTHUNK_LOOKUPENTRY(buffers[0]))->size;
                    else
                        BufferSize = 0;

                    DataSize += BufferSize;

                    // Increment reference counter for buffer
                    if (buffers[0])
                        ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(buffers[0])))->refcount++;

                    ALBufferList = ALBufferListStart;

                    for (i = 1; i < n; i++)
                    {
                        ALBufferList->next = malloc(sizeof(ALbufferlistitem));
                        ALBufferList->next->buffer = buffers[i];
                        ALBufferList->next->bufferstate = PENDING;
                        ALBufferList->next->flag = 0;
                        ALBufferList->next->next = NULL;

                        if (buffers[i])
                            BufferSize = ((ALbuffer*)ALTHUNK_LOOKUPENTRY(buffers[i]))->size;
                        else
                            BufferSize = 0;

                        DataSize += BufferSize;

                        // Increment reference counter for buffer
                        if (buffers[i])
                            ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(buffers[i])))->refcount++;

                        ALBufferList = ALBufferList->next;
                    }

                    if (ALSource->queue == NULL)
                    {
                        ALSource->queue = ALBufferListStart;
                        // Update Current Buffer
                        ALSource->ulBufferID = ALBufferListStart->buffer;
                    }
                    else
                    {
                        // Find end of queue
                        ALBufferList = ALSource->queue;
                        while (ALBufferList->next != NULL)
                        {
                            ALBufferList = ALBufferList->next;
                        }

                        ALBufferList->next = ALBufferListStart;
                    }

                    // Update number of buffers in queue
                    ALSource->BuffersInQueue += n;

                    // Record the amount of data added to the queue
                    ALSource->SizeOfBufferDataAddedToQueue = DataSize;
                    ALSource->NumBuffersAddedToQueue = n;
                    ALSource->update1 |= SQUEUE;
                    UpdateContext(Context, ALSOURCE, source);

                    // Check if we need to switch from mono to stereo or vice versa
                    if ((Context->Device->lpDS3DListener) && ((ALSource->state == AL_STOPPED) || (ALSource->state == AL_INITIAL)))
                        CheckSourceType(Context, ALSource);
                }
            }
            else
            {
                // Invalid Source Type (can't queue on a Static Source)
                alSetError(AL_INVALID_OPERATION);
            }
        }
        else
        {
            // Invalid Source Name
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


// Implementation assumes that n is the number of buffers to be removed from the queue and buffers is
// an array of buffer IDs that are to be filled with the names of the buffers removed
ALAPI ALvoid ALAPIENTRY alSourceUnqueueBuffers( ALuint source, ALsizei n, ALuint* buffers )
{
    ALCcontext *Context;
    ALsource *ALSource;
    ALsizei i;
    ALbufferlistitem *ALBufferList;
    ALuint DataSize;
    ALuint BufferSize;
    ALuint BufferID;
    ALboolean bBuffersProcessed;

    if (n == 0)
        return;

    DataSize = 0;
    BufferSize = 0;
    bBuffersProcessed = AL_TRUE;

    Context=alcGetCurrentContext();
    if (Context)
    {
        SuspendContext(Context);

        if (alIsSource(source))
        {
            ALSource = (ALsource*)ALTHUNK_LOOKUPENTRY(source);

            // Check that all 'n' buffers have been processed
            ALBufferList = ALSource->queue;
            for (i = 0; i < n; i++)
            {
                if ((ALBufferList != NULL) && (ALBufferList->bufferstate == PROCESSED))
                {
                    ALBufferList = ALBufferList->next;
                }
                else
                {
                    bBuffersProcessed = AL_FALSE;
                    break;
                }
            }

            // If all 'n' buffers have been processed, remove them from the queue
            if (bBuffersProcessed)
            {
                for (i = 0; i < n; i++)
                {
                    ALBufferList = ALSource->queue;

                    ALSource->queue = ALBufferList->next;
                    // Record name of buffer
                    buffers[i] = ALBufferList->buffer;
                    // Decrement buffer reference counter
                    if (ALBufferList->buffer)
                        ((ALbuffer*)(ALTHUNK_LOOKUPENTRY(ALBufferList->buffer)))->refcount--;
                    // Record size of buffer
                    if (ALBufferList->buffer)
                        BufferSize = ((ALbuffer*)ALTHUNK_LOOKUPENTRY(ALBufferList->buffer))->size;
                    else
                        BufferSize = 0;

                    DataSize += BufferSize;
                    // Release memory for buffer list item
                    free(ALBufferList);
                    ALSource->BuffersInQueue--;
                    ALSource->BuffersProcessed--;
                }

                if (ALSource->state != AL_PLAYING)
                {
                    if (ALSource->queue)
                        BufferID = ALSource->queue->buffer;
                    else
                        BufferID = 0;

                    ALSource->ulBufferID = BufferID;
                }

                ALSource->NumBuffersRemovedFromQueue = n;
                ALSource->SizeOfBufferDataRemovedFromQueue = DataSize;

                if (ALSource->NumBuffersRemovedFromQueue > ALSource->BuffersAddedToDSBuffer)
                {
                    ALSource->BuffersAddedToDSBuffer = 0;
                    ALSource->BufferPosition = 0;
                }
                else
                {
                    ALSource->BuffersAddedToDSBuffer -= ALSource->NumBuffersRemovedFromQueue;
                }

                ALSource->update1 |= SUNQUEUE;
                UpdateContext(Context, ALSOURCE, source);
            }
            else
            {
                // Some buffers can't be unqueue because they have not been processed
                alSetError(AL_INVALID_VALUE);
            }
        }
        else
        {
            // Invalid Source Name
            alSetError(AL_INVALID_NAME);
        }

        ProcessContext(Context);
    }
    else
    {
        // Invalid Context
        alSetError(AL_INVALID_OPERATION);
    }

    return;
}


ALvoid InitSourceParams(ALsource *pSource)
{
    pSource->flInnerAngle = 360.0f;
    pSource->flOuterAngle = 360.0f;
    pSource->flPitch = 1.0f;
    pSource->vPosition[0] = 0.0f;
    pSource->vPosition[1] = 0.0f;
    pSource->vPosition[2] = 0.0f;
    pSource->vOrientation[0] = 0.0f;
    pSource->vOrientation[1] = 0.0f;
    pSource->vOrientation[2] = 0.0f;
    pSource->vVelocity[0] = 0.0f;
    pSource->vVelocity[1] = 0.0f;
    pSource->vVelocity[2] = 0.0f;
    pSource->flRefDistance = 1.0f;
    pSource->flMaxDistance = FLT_MAX;
    pSource->flRollOffFactor = 1.0f;
    pSource->bLooping = AL_FALSE;
    pSource->flGain = 1.0f;
    pSource->flMinGain = 0.0f;
    pSource->flMaxGain = 1.0f;
    pSource->flOuterGain = 0.0f;

    pSource->state = AL_INITIAL;
    pSource->lSourceType = AL_UNDETERMINED;

    pSource->ulBufferID= 0;

    pSource->flDistance = 0.0f;
    pSource->lAttenuationVolume = 0;
    pSource->lVolume = 0;
    pSource->lMaxVolume = 0;
    pSource->lMinVolume = -10000;
    pSource->lFinalVolume = 0;
    pSource->EAX20BP.lDirect = EAXBUFFER_DEFAULTDIRECT;
    pSource->EAX20BP.lDirectHF = EAXBUFFER_DEFAULTDIRECTHF;
    pSource->EAX20BP.lRoom = EAXBUFFER_DEFAULTROOM;
    pSource->EAX20BP.lRoomHF = EAXBUFFER_DEFAULTROOMHF;
    pSource->EAX20BP.lObstruction = EAXBUFFER_DEFAULTOBSTRUCTION;
    pSource->EAX20BP.flObstructionLFRatio = EAXBUFFER_DEFAULTOBSTRUCTIONLFRATIO;
    pSource->EAX20BP.lOcclusion = EAXBUFFER_DEFAULTOCCLUSION;
    pSource->EAX20BP.flOcclusionLFRatio = EAXBUFFER_DEFAULTOCCLUSIONLFRATIO;
    pSource->EAX20BP.flOcclusionRoomRatio = EAXBUFFER_DEFAULTOCCLUSIONROOMRATIO;
    pSource->EAX20BP.lOutsideVolumeHF = EAXBUFFER_DEFAULTOUTSIDEVOLUMEHF;
    pSource->EAX20BP.flRoomRolloffFactor = EAXBUFFER_DEFAULTROOMROLLOFFFACTOR;
    pSource->EAX20BP.flAirAbsorptionFactor = 0.0f;
    pSource->EAX20BP.dwFlags = EAXBUFFER_DEFAULTFLAGS;

    pSource->update1 |= SGENERATESOURCE | CONEANGLES | FREQUENCY | POSITION | VELOCITY | ORIENTATION |
        MINDIST | MAXDIST | LOOPED | VOLUME | CONEOUTSIDEVOLUME | STATE | ROLLOFFFACTOR;
}


ALboolean CheckSourceType(ALCcontext *pContext, ALsource *pSource)
{
    DSBUFFERDESC DSBDescription;
    DS3DBUFFER DS3DBuffer;
    WAVEFORMATEX OutputType;
    ALbufferlistitem *ALBufferListItem;
    ALuint    BufferID = 0;
    ALuint    Channels;
    ALint    volume;

    // Find first non-NULL Buffer ID in the queue
    ALBufferListItem = pSource->queue;
    while (ALBufferListItem)
    {
        if (ALBufferListItem->buffer)
        {
            BufferID = ALBufferListItem->buffer;
            break;
        }
        ALBufferListItem = ALBufferListItem->next;
    }

    if (BufferID == 0)
        return AL_TRUE;

    // Check if the buffer is stereo
    Channels = (((((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferID))->format==AL_FORMAT_MONO8)||(((ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferID))->format==AL_FORMAT_MONO16))?1:2);

    if ((Channels == 2) && (pSource->SourceType == SOURCE3D))
    {
        // Playing a stereo buffer

        // Need to destroy the DS Streaming Mono 3D Buffer and create a Stereo 2D buffer
        if (pSource->uservalue3)
        {
            IKsPropertySet_Release((LPKSPROPERTYSET)pSource->uservalue3);
            pSource->uservalue3 = NULL;
        }
        if (pSource->uservalue2)
        {
            IDirectSound3DBuffer_Release((LPDIRECTSOUND3DBUFFER)pSource->uservalue2);
            pSource->uservalue2 = NULL;
        }
        if (pSource->uservalue1)
        {
            IDirectSoundBuffer_Stop((LPDIRECTSOUNDBUFFER)pSource->uservalue1);
            IDirectSoundBuffer_Release((LPDIRECTSOUNDBUFFER)pSource->uservalue1);
            pSource->uservalue1=NULL;
        }

        pSource->DSBufferPlaying = AL_FALSE;
        pSource->SourceType = SOURCE2D;

        // Set Caps
        memset(&DSBDescription,0,sizeof(DSBUFFERDESC));
        DSBDescription.dwSize=sizeof(DSBUFFERDESC);
        DSBDescription.dwFlags=DSBCAPS_CTRLVOLUME|DSBCAPS_CTRLFREQUENCY|DSBCAPS_GLOBALFOCUS|
            DSBCAPS_GETCURRENTPOSITION2|DSBCAPS_LOCSOFTWARE;
        DSBDescription.dwBufferBytes=88200;
        DSBDescription.lpwfxFormat=&OutputType;
        memset(&OutputType,0,sizeof(WAVEFORMATEX));
        OutputType.wFormatTag=WAVE_FORMAT_PCM;
        OutputType.nChannels=2;
        OutputType.wBitsPerSample=16;
        OutputType.nBlockAlign=4;
        OutputType.nSamplesPerSec=44100;
        OutputType.nAvgBytesPerSec=176400;
        OutputType.cbSize=0;
        if (IDirectSound_CreateSoundBuffer(pContext->Device->lpDS,&DSBDescription,(LPDIRECTSOUNDBUFFER *)&pSource->uservalue1,NULL)==DS_OK)
        {
            IDirectSoundBuffer_SetCurrentPosition((LPDIRECTSOUNDBUFFER)pSource->uservalue1,0);
        }

        // Check the buffer was created successfully
        if (pSource->uservalue1 == NULL)
            return AL_FALSE;

        // Update variables
        pSource->OldPlayCursor = 0;
        pSource->OldWriteCursor = 0;
        pSource->DSFrequency = 44100;
        pSource->lAttenuationVolume = 0;
        pSource->lFinalVolume = 0;

        if (pContext->bUseManualAttenuation)
        {
            SetSourceLevel(pSource, 0);
        }
        else
        {
            volume = pSource->lVolume + pContext->Listener.lVolume;
            CLAMP(volume, -10000, 0)
            IDirectSoundBuffer_SetVolume((LPDIRECTSOUNDBUFFER)pSource->uservalue1, volume);
        }
    }
    else if ((Channels == 1) && (pSource->SourceType == SOURCE2D))
    {
        // Playing a (3D) Mono buffer

        // Need to destroy the stereo streaming buffer and create a 3D mono one instead
        if (pSource->uservalue1)
        {
            IDirectSoundBuffer_Stop((LPDIRECTSOUNDBUFFER)pSource->uservalue1);
            IDirectSoundBuffer_Release((LPDIRECTSOUNDBUFFER)pSource->uservalue1);
            pSource->uservalue1=NULL;
        }

        pSource->DSBufferPlaying = AL_FALSE;
        pSource->SourceType = SOURCE3D;

        // Set Caps
        memset(&DSBDescription,0,sizeof(DSBUFFERDESC));
        DSBDescription.dwSize=sizeof(DSBUFFERDESC);
        DSBDescription.dwFlags=DSBCAPS_CTRLVOLUME|DSBCAPS_CTRLFREQUENCY|DSBCAPS_CTRL3D|DSBCAPS_GLOBALFOCUS|
            DSBCAPS_GETCURRENTPOSITION2|DSBCAPS_LOCHARDWARE;
        DSBDescription.dwBufferBytes=88200;
        DSBDescription.lpwfxFormat=&OutputType;
        memset(&OutputType,0,sizeof(WAVEFORMATEX));
        OutputType.wFormatTag=WAVE_FORMAT_PCM;
        OutputType.nChannels=1;
        OutputType.wBitsPerSample=16;
        OutputType.nBlockAlign=2;
        OutputType.nSamplesPerSec=44100;
        OutputType.nAvgBytesPerSec=88200;
        OutputType.cbSize=0;

        if (IDirectSound_CreateSoundBuffer(pContext->Device->lpDS,&DSBDescription,(LPDIRECTSOUNDBUFFER *)&pSource->uservalue1,NULL)==DS_OK)
        {
            IDirectSoundBuffer_SetCurrentPosition((LPDIRECTSOUNDBUFFER)pSource->uservalue1,0);

            // Get 3D Interface
            if (IDirectSoundBuffer_QueryInterface((LPDIRECTSOUNDBUFFER)pSource->uservalue1,&IID_IDirectSound3DBuffer,(LPUNKNOWN *)&pSource->uservalue2)==DS_OK)
            {
                // Get Property Set Interface
                IDirectSound3DBuffer_QueryInterface((LPDIRECTSOUND3DBUFFER)pSource->uservalue2,&IID_IKsPropertySet,(LPUNKNOWN *)&pSource->uservalue3);
            }
        }

        // Check the buffer was created successfully
        if ((pSource->uservalue1 == NULL) || (pSource->uservalue2 == NULL))
            return AL_FALSE;

        // Set 3D Properties
        memset(&DS3DBuffer, 0, sizeof(DS3DBuffer));
        DS3DBuffer.dwSize = sizeof(DS3DBUFFER);
        DS3DBuffer.vPosition.x = pSource->vPosition[0];
        DS3DBuffer.vPosition.y = pSource->vPosition[1];
        DS3DBuffer.vPosition.z = -pSource->vPosition[2];
        DS3DBuffer.vVelocity.x = pSource->vVelocity[0];
        DS3DBuffer.vVelocity.y = pSource->vVelocity[1];
        DS3DBuffer.vVelocity.z = -pSource->vVelocity[2];
        DS3DBuffer.dwInsideConeAngle = (ALuint)pSource->flInnerAngle;
        DS3DBuffer.dwOutsideConeAngle = (ALuint)pSource->flOuterAngle;
        DS3DBuffer.dwMode = pSource->bHeadRelative ? DS3DMODE_HEADRELATIVE : DS3DMODE_NORMAL;
        DS3DBuffer.flMinDistance = pSource->flRefDistance;
        DS3DBuffer.flMaxDistance = pSource->flMaxDistance;
        DS3DBuffer.lConeOutsideVolume = LinearGainToMB(pSource->flOuterGain);
        DS3DBuffer.vConeOrientation.x = pSource->vOrientation[0];
        DS3DBuffer.vConeOrientation.y = pSource->vOrientation[1];
        DS3DBuffer.vConeOrientation.z = -pSource->vOrientation[2];
        // Make sure Cone Orientation is not 0,0,0 (which is Open AL's default !)
        if ((DS3DBuffer.vConeOrientation.x == 0.0f) && (DS3DBuffer.vConeOrientation.y == 0.0f) && (DS3DBuffer.vConeOrientation.z == 0.0f))
            DS3DBuffer.vConeOrientation.z = 1.0f;
        IDirectSound3DBuffer_SetAllParameters((LPDIRECTSOUND3DBUFFER)pSource->uservalue2, &DS3DBuffer, DS3D_IMMEDIATE);

        // Set EAX Properties (if they have been applied)
        if (pSource->uservalue3)
        {
            if (bEAX2Initialized)
            {
                IKsPropertySet_Set((LPKSPROPERTYSET)pSource->uservalue3, &DSPROPSETID_EAX20_BufferProperties, DSPROPERTY_EAXBUFFER_ALLPARAMETERS, NULL, 0, &pSource->EAX20BP, sizeof(EAXBUFFERPROPERTIES));
            }
        }

        // Update variables
        pSource->OldPlayCursor = 0;
        pSource->OldWriteCursor = 0;
        pSource->DSFrequency = 44100;

        pSource->lFinalVolume = 0;

        // If manual attenuation, force an update
        if (pContext->bUseManualAttenuation)
        {
            SetSourceLevel(pSource, LEVELFLAG_RECALCULATE_ATTENUATION);
        }
        else
        {
            volume = pSource->lVolume + pContext->Listener.lVolume;
            CLAMP(volume, -10000, 0)
            IDirectSoundBuffer_SetVolume((LPDIRECTSOUNDBUFFER)pSource->uservalue1, volume);
        }
    }

    return AL_TRUE;
}


/*
    GetSourceOffset

    Gets the current playback position in the given Source, in the appropriate format (Bytes, Samples or MilliSeconds)
    The offset is relative to the start of the queue (not the start of the current buffer)
*/
ALboolean GetSourceOffset(ALCcontext *pContext, ALsource *pSource, ALenum eName, ALfloat *pflOffset)
{
    ALbufferlistitem *pBufferList;
    ALfloat        flBufferFreq;
    ALint        lBufferSize, lBytesPlayed, lChannels;
    ALenum        eOriginalFormat;
    ALboolean    bReturn = AL_TRUE;
    ALint        lTotalBufferDataSize;

    if (((pSource->state == AL_PLAYING) || (pSource->state == AL_PAUSED)) && (pSource->ulBufferID))
    {
        // Get Current Buffer Size and frequency (in milliseconds)
        lBufferSize = ((ALbuffer*)ALTHUNK_LOOKUPENTRY(pSource->ulBufferID))->size;
        flBufferFreq = (ALfloat)(((ALbuffer*)ALTHUNK_LOOKUPENTRY(pSource->ulBufferID))->frequency);
        eOriginalFormat = ((ALbuffer*)ALTHUNK_LOOKUPENTRY(pSource->ulBufferID))->eOriginalFormat;
        lChannels = ((((ALbuffer*)ALTHUNK_LOOKUPENTRY(pSource->ulBufferID))->format == AL_FORMAT_MONO16)?1:2);

        // Get Current BytesPlayed
        if (pContext->Device->lpDS3DListener)
        {
            lBytesPlayed = pSource->lBytesPlayed; // NOTE : This IS the number of bytes relative to start of queue
        }
        else
        {
            lBytesPlayed = pSource->position * lChannels * 2; // NOTE : This is the byte offset into the *current* buffer
            // Add byte length of any processed buffers in the queue
            pBufferList = pSource->queue;
            while ((pBufferList) && (pBufferList->bufferstate == PROCESSED))
            {
                lBytesPlayed += ((ALbuffer*)ALTHUNK_LOOKUPENTRY(pBufferList->buffer))->size;
                pBufferList = pBufferList->next;
            }
        }

        if (pContext->Device->lpDS3DListener)
        {
            lTotalBufferDataSize = pSource->TotalBufferDataSize;
        }
        else
        {
            lTotalBufferDataSize = 0;
            pBufferList = pSource->queue;
            while (pBufferList)
            {
                if (pBufferList->buffer)
                    lTotalBufferDataSize += ((ALbuffer*)ALTHUNK_LOOKUPENTRY(pBufferList->buffer))->size;
                pBufferList = pBufferList->next;
            }
        }

        if (pSource->bLooping)
        {
            if (lBytesPlayed < 0)
                lBytesPlayed = 0;
            else
                lBytesPlayed = lBytesPlayed % lTotalBufferDataSize;
        }
        else
        {
            // Clamp BytesPlayed to within 0 and lTotalBufferDataSize
            CLAMP(lBytesPlayed, 0, lTotalBufferDataSize)
        }

        switch (eName)
        {
        case AL_SEC_OFFSET:
            *pflOffset = ((ALfloat)lBytesPlayed / (lChannels * 2.0f * flBufferFreq));
            break;
        case AL_SAMPLE_OFFSET:
            *pflOffset = (ALfloat)(lBytesPlayed / (lChannels * 2));
            break;
        case AL_BYTE_OFFSET:
            // Take into account the original format of the Buffer
            if ((eOriginalFormat == AL_FORMAT_MONO8) || (eOriginalFormat == AL_FORMAT_STEREO8))
            {
                *pflOffset = (ALfloat)(lBytesPlayed >> 1);
            }
            else if ((eOriginalFormat == AL_FORMAT_MONO_IMA4) || (eOriginalFormat == AL_FORMAT_STEREO_IMA4))
            {
                // Compression rate of the ADPCM supported is 3.6111 to 1
                lBytesPlayed = (ALint)((ALfloat)lBytesPlayed / 3.6111f);
                // Round down to nearest ADPCM block
                *pflOffset = (ALfloat)((lBytesPlayed / (36 * lChannels)) * 36 * lChannels);
            }
            else
            {
                *pflOffset = (ALfloat)lBytesPlayed;
            }
            break;
        }
    }
    else
    {
        *pflOffset = 0.0f;
    }

    return bReturn;
}


/*
    ApplyOffset

    Apply a playback offset to the Source.  This function will update the queue (to correctly
    mark buffers as 'pending' or 'processed' depending upon the new offset.
*/
void ApplyOffset(ALCcontext *pContext, ALsource *pSource, ALboolean bUpdateContext)
{
    ALbufferlistitem    *pBufferList;
    ALint                lBufferSize, lTotalBufferSize;
    ALint                lByteOffset;

    // Get true byte offset
    lByteOffset = GetByteOffset(pContext, pSource);

    // If this is a valid offset apply it
    if (lByteOffset != -1)
    {
        // Sort out the queue (pending and processed states)
        pBufferList = pSource->queue;
        lTotalBufferSize = 0;
        pSource->BuffersAddedToDSBuffer = 0;
        pSource->BuffersProcessed = 0;
        while (pBufferList)
        {
            lBufferSize = pBufferList->buffer ? ((ALbuffer*)ALTHUNK_LOOKUPENTRY(pBufferList->buffer))->size : 0;

            if ((lTotalBufferSize + lBufferSize) <= lByteOffset)
            {
                // Offset is past this buffer so increment BuffersAddedToDSBuffer and if the Source is NOT looping
                // update the state to PROCESSED
                pSource->BuffersAddedToDSBuffer++;

                if (!pSource->bLooping)
                {
                    pBufferList->bufferstate = PROCESSED;
                    pSource->BuffersProcessed++;
                }
            }
            else if (lTotalBufferSize <= lByteOffset)
            {
                // Offset is within this buffer
                pBufferList->bufferstate = PENDING;

                // Set Current Buffer ID
                pSource->ulBufferID = pBufferList->buffer;

                // Set current position in this buffer
                pSource->BufferPosition = lByteOffset - lTotalBufferSize;

                // Set Total Bytes Played to Offset
                pSource->lBytesPlayed = lByteOffset;

                // SW Mixer Positions are in Samples
                pSource->position = pSource->BufferPosition / ((((ALbuffer*)ALTHUNK_LOOKUPENTRY(pBufferList->buffer))->format == AL_FORMAT_MONO16)?2:4);
            }
            else
            {
                // Offset is before this buffer, so mark as pending
                pBufferList->bufferstate = PENDING;
            }

            // Increment the TotalBufferSize
            lTotalBufferSize += lBufferSize;

            // Move on to next buffer in the Queue
            pBufferList = pBufferList->next;
        }

        if ((bUpdateContext) && (pContext->Device->lpDS3DListener))
        {
            pSource->lOffset = lByteOffset;
            pSource->lOffsetType = AL_BYTE_OFFSET;
            pSource->update1 |= OFFSET;
            UpdateContext(pContext, ALSOURCE, pSource->source);
        }
    }
    else
    {
        if (bUpdateContext)
            alSetError(AL_INVALID_VALUE);
    }

    // Clear Offset
    pSource->lOffset = 0;
}


/*
    GetByteOffset

    Returns the 'true' byte offset into the Source's queue (from the Sample, Byte or Millisecond
    offset supplied by the application).   This takes into account the fact that the buffer format
    may have been modifed by AL (e.g 8bit samples are converted to 16bit)
*/
ALint GetByteOffset(ALCcontext *pContext, ALsource *pSource)
{
    ALbuffer *pBuffer = NULL;
    ALbufferlistitem *pBufferList;
    ALfloat    flBufferFreq;
    ALint    lChannels;
    ALint    lByteOffset = -1;
    ALint    lTotalBufferDataSize;

    // Find the first non-NULL Buffer in the Queue
    pBufferList = pSource->queue;
    while (pBufferList)
    {
        if (pBufferList->buffer)
        {
            pBuffer = (ALbuffer*)ALTHUNK_LOOKUPENTRY(pBufferList->buffer);
            break;
        }
        pBufferList = pBufferList->next;
    }

    if (pBuffer)
    {
        flBufferFreq = ((ALfloat)pBuffer->frequency);
        lChannels = (pBuffer->format == AL_FORMAT_MONO16)?1:2;

        // Determine the ByteOffset (and ensure it is block aligned)
        switch (pSource->lOffsetType)
        {
        case AL_BYTE_OFFSET:
            // Take into consideration the original format
            if ((pBuffer->eOriginalFormat == AL_FORMAT_MONO8) || (pBuffer->eOriginalFormat == AL_FORMAT_STEREO8))
            {
                lByteOffset = pSource->lOffset * 2;
                lByteOffset -= (lByteOffset % (lChannels * 2));
            }
            else if ((pBuffer->eOriginalFormat == AL_FORMAT_MONO_IMA4) || (pBuffer->eOriginalFormat == AL_FORMAT_STEREO_IMA4))
            {
                // Round down to nearest ADPCM block
                lByteOffset = (pSource->lOffset / (36 * lChannels)) * 36 * lChannels;
                // Multiply by compression rate
                lByteOffset = (ALint)(3.6111f * (ALfloat)lByteOffset);
                lByteOffset -= (lByteOffset % (lChannels * 2));
            }
            else
            {
                lByteOffset = pSource->lOffset;
                lByteOffset -= (lByteOffset % (lChannels * 2));
            }
            break;

        case AL_SAMPLE_OFFSET:
            lByteOffset = pSource->lOffset * lChannels * 2;
            break;

        case AL_SEC_OFFSET:
            // Note - lOffset is internally stored as Milliseconds
            lByteOffset = (ALint)(pSource->lOffset * lChannels * 2.0f * flBufferFreq / 1000.0f);
            lByteOffset -= (lByteOffset % (lChannels * 2));
            break;
        }

        if (pContext->Device->lpDS3DListener)
        {
            lTotalBufferDataSize = pSource->TotalBufferDataSize;
        }
        else
        {
            lTotalBufferDataSize = 0;
            pBufferList = pSource->queue;
            while (pBufferList)
            {
                if (pBufferList->buffer)
                    lTotalBufferDataSize += ((ALbuffer*)ALTHUNK_LOOKUPENTRY(pBufferList->buffer))->size;
                pBufferList = pBufferList->next;
            }
        }

        // Finally, if the ByteOffset is beyond the length of all the buffers in the queue, return -1
        if (lByteOffset >= lTotalBufferDataSize)
            lByteOffset = -1;
    }

    return lByteOffset;
}
